In the annals of military history, there are countless examples of commanders finding unique and interesting ways to get security awareness training to their people. I imagine Hannibal having posters that made coy references to the "element of surprise" and OPSEC. You can guarantee Ceasar had posters ironically about insider threats. In today's modern military, commanders have been less creative and still don't get why marketers declare "Location, location, location!"
